CN104005924B - High-power radial plunger pump - Google Patents

Abstract

A high-power radial plunger pump belongs to the field of machinery. Specifically, the invention relates to a high-power radial plunger pump. The invention provides a high-power radial plunger pump with small volume, simple structure, convenient processing, long service life and low cost. The invention includes a shell with a cavity inside, and a liquid suction port connected to the cavity is arranged on the surface of the shell, and a cam is set in the middle of the shell through a rotating shaft, and at least two plungers are set on the cam through a pull ring; each plunger The ends of the plunger cylinders are all set in a plunger cylinder, the end of the plunger cylinder is provided with a liquid inlet connected to the cavity, and a liquid suction valve is arranged in the liquid inlet; both sides of the plunger cylinder are provided with valves corresponding to the shell The matched first hollow trunnion and the second hollow trunnion; the housing is provided with an annular high-pressure chamber; the first hollow trunnion of each plunger cylinder communicates with the annular high-pressure chamber, and the first hollow trunnion corresponds to The annular high-pressure chamber is provided with a liquid discharge valve; the surface of the shell is provided with a liquid outlet communicating with the annular high-pressure chamber.

Description

High Power Radial Piston Pump

technical field

The invention belongs to the mechanical field, in particular, the invention relates to a high-power radial piston pump.

Background technique

The existing high-pressure and large-flow diaphragm pumps produced at home and abroad are all arranged horizontally with three crankshaft plunger cylinders, or with double crankshaft plunger cylinders. Because the plunger cylinders are arranged horizontally, the span of the crankshaft support point is too large, and the size of the crankshaft journal and other related components must be increased to ensure effective power output. Therefore adopt the equipment volume of this kind of structural mode too big, equipment weight is too heavy.

The Chinese patent application number is 200910102304.8, and the name is the invention patent application of "Eccentrically Driven Circumferentially Distributed Piston Pump". The technical solution announced is to install a cam at the end of the driving shaft, and install a bearing outside the cam. The bearing is the same as the plunger in the housing. The ends are in contact, and a return spring is set on the plunger. The plunger is reciprocated by the rotation of the cam and the push of the return spring.

This structure has the following disadvantages: 1. When the cam rotates, the plunger is always affected by the lateral force, the service life is short, and it cannot adapt to the high-pressure working environment.

2. There are many force transmission parts, the structure is complex, the radial dimension is increased, and the friction loss is large.

3. The spring occupies a large space in the radial dimension, which increases the volume of the entire pump body, wastes materials, and increases the cost.

4. Each plunger can only inhale and discharge the liquid independently, and there are too many connecting pipelines outside the pump body. The theory of multi-cylinder work is feasible, but it is difficult to realize in practical application.

Contents of the invention

The present invention aims at the above problems and provides a high-power radial piston pump with small volume, simple structure, convenient processing, long service life and low cost.

In order to achieve the above-mentioned purpose of the present invention, the present invention adopts the following technical scheme. The present invention includes a housing with a cavity inside. The surface of the housing is provided with a liquid suction port that communicates with the cavity. The main points of the structure are that a cam is provided in the middle of the housing through a rotating shaft. , the cam is provided with at least two plungers through the pull ring; the end of each plunger is arranged in a plunger cylinder, and the end of the plunger cylinder is provided with a liquid inlet communicating with the cavity, and the liquid inlet is provided with There is a liquid suction valve; both sides of the plunger cylinder are provided with a first hollow trunnion and a second hollow trunnion matched with the housing; an annular high-pressure chamber is arranged inside the housing; the first hollow trunnion of each plunger cylinder The hollow trunnions are all in communication with the annular high-pressure chamber, and a liquid discharge valve is arranged in the first hollow trunnion corresponding to the annular high-pressure chamber; the surface of the shell is provided with a liquid outlet connected to the annular high-pressure chamber.

As a preferred solution of the present invention, a balance valve is provided in the second hollow trunnion on each plunger cylinder, and balance grooves communicating with each other are provided on the housing corresponding to the second hollow trunnion.

Beneficial effects of the present invention: 1. The hydraulic pump of the present invention can reduce the weight of the equipment by more than 60% compared with the existing three-turn or two-turn plunger-cylinder horizontally arranged transmission forms.

2. Compared with the patent application of application number 200910102304.8, the hydraulic drive pump of the present invention has a plunger cylinder that can swing around the first hollow trunnion and the second hollow trunnion, and adopts a swing structure for positioning. The influence of force, the force condition is good, the service life is long, and it is more suitable for high-pressure work (above 35MPa).

3. In the hydraulic pump of the present invention, the plunger adopts a static pressure balance structure to cooperate with the cam, and has fewer force transmission parts. Compared with the patent application with application number 200910102304.8, the radial size of the pump body is reduced, and the friction loss is small.

4. The hydraulic pump of the present invention uses a pull ring to position the plunger on the cam. Compared with the spring of the reference document, the volume is greatly reduced, and the radial dimension of the hydraulic drive pump is further reduced.

5. The unique design of the housing of the present invention can ensure the effective combination of multiple plunger cylinders, realize centralized liquid suction and discharge, and facilitate the application of hydraulic pumps in various occasions.

Description of drawings

Fig. 1 is a schematic structural diagram of a hydraulically driven pump of the present invention.

FIG. 2 is a side sectional view of FIG. 1 .

In the accompanying drawings, 1 is the shell, 2 is the cavity, 3 is the plunger cylinder, 4 is the first hollow trunnion, 5 is the plunger, 6 is the plunger slide seat, 7 is the rotating shaft, 8 is the pull ring, 9 is the Outer tube, 10 is filled with nylon, 11 is the central tube, 12 is the cam, 13 is the suction valve, 14 is the liquid inlet, 15 is the annular high-pressure chamber, 16 is the suction port, 17 is the liquid outlet, 18 is the discharge port Liquid valve, 19 is a balance valve, 20 is a second hollow trunnion, and 21 is a balance tank.

detailed description

The present invention includes a housing 1 with a cavity 2 inside. The surface of the housing 1 is provided with a liquid suction port 16 communicating with the cavity 2. The middle part of the housing 1 is provided with a cam 12 through a rotating shaft 7. The cam 12 is provided with a ring 8 through a At least two plungers 5; the end of each plunger 5 is arranged in a plunger cylinder 3, and the end of the plunger cylinder 3 is provided with a liquid inlet 14 communicating with the cavity 2, and the liquid inlet 14 is provided with There is a liquid suction valve 13; both sides of the plunger cylinder 3 are provided with a first hollow trunnion 4 and a second hollow trunnion 20 matched with the housing 1; the housing 1 is provided with an annular high-pressure chamber 15; The first hollow trunnion 4 of each plunger cylinder 3 is in communication with the annular high-pressure chamber 15, and a drain valve 18 is arranged in the first hollow trunnion 4 corresponding to the annular high-pressure chamber 15; the surface of the housing 1 is provided with It communicates with the liquid outlet 17 of the annular high-pressure chamber 15 .

As a preferred solution of the present invention, a balance valve 19 is provided in the second hollow trunnion 20 on each of the plunger cylinders 3, and a valve 19 is provided on the housing 1 corresponding to the second hollow trunnion 20 to communicate with each other. The balance tank 21. Through the cooperation of the balance valve 19 and the balance tank 21, a static pressure balance structure is formed, which offsets the hydraulic thrust at one end of the discharge valve 18, ensures that the plunger cylinder 3 is in a floating suspension state during operation, and prolongs the service life.

The plunger 5 includes a plunger slide 6 matched with the pull ring 8; the plunger slide 6 is provided with a central tube 11, a filled nylon 10 and an outer tube 9 sequentially from inside to outside. The plunger 5 adopts a combined structure, which can greatly reduce the quality of the plunger 5 .

The plunger slide seat 6 is provided with a central damping hole and a pressure balance groove. When the present invention works, the pressure at both ends of the plunger 5 can be balanced, so that the hydraulic pump is more suitable for working under high pressure.

The plunger cylinders 3 are evenly distributed on the circumference of the cam 12 . The plunger 5 is also evenly distributed on the circumference of the cam 12 under the limit action of the plunger cylinder 3, so that the cam 12 and the rotating shaft 7 are evenly stressed and the service life is prolonged.

The pull ring 8 is two ring bodies with L-shaped cross section, and the two L-shaped ring bodies are relatively arranged outside the cam 12, and a slip ring is arranged between the two L-shaped ring bodies; the plunger slide seat 6 is set It is between the two pull rings 8 and passed through by the slip ring.

A course of action of the present invention is described below in conjunction with the accompanying drawings: during use, the rotating shaft 7 drives the cam 12 to rotate, and the cam 12 drives the plunger 5 to reciprocate in the plunger cylinder 3, and the plunger cylinder 3 moves between the first trunnion and the second trunnion Swing under the limitation of the shaft; when the plunger 5 reciprocates in the suction stroke, the liquid is sucked by the liquid suction valve 13 on the top of the plunger cylinder 3; The shell 1 is provided with an annular high-pressure chamber 15 outside the center hole, and the annular high-pressure chamber 15 is respectively connected with each plunger cylinder 3 to discharge the liquid discharged from each plunger 5 collectively. The present invention can effectively ensure the reliable operation of the multi-cylinder.

It can be understood that the above specific descriptions of the present invention are only used to illustrate the present invention and are not limited to the technical solutions described in the embodiments of the present invention. Those of ordinary skill in the art should understand that the present invention can still be modified or Equivalent replacements to achieve the same technical effect; as long as they meet the needs of use, they are all within the protection scope of the present invention.

Claims (6)

1. A high-power radial piston pump, including a housing (1) with a cavity (2) inside, and a liquid suction port (16) connected to the cavity (2) on the surface of the housing (1), characterized in that A cam (12) is provided in the middle of the housing (1) through a rotating shaft (7), and at least two plungers (5) are arranged on the cam (12) through a pull ring (8); the end of each plunger (5) All are set in a plunger cylinder (3), the end of the plunger cylinder (3) is provided with a liquid inlet (14) communicating with the cavity (2), and a liquid suction valve is arranged in the liquid inlet (14) (13); both sides of the plunger cylinder (3) are provided with a first hollow trunnion (4) and a second hollow trunnion (20) matched with the housing (1); the housing (1) There is an annular high-pressure chamber (15) inside; the first hollow trunnion (4) of each plunger cylinder (3) communicates with the annular high-pressure chamber (15), and the first hollow trunnion (4) corresponds to the annular high-pressure The cavity (15) is provided with a liquid discharge valve (18); the surface of the housing (1) is provided with a liquid outlet (17) communicating with the annular high-pressure chamber (15). 2. The high-power radial piston pump according to claim 1, characterized in that: a balance valve (19) is provided in the second hollow trunnion (20) on each of the plunger cylinders (3) ), the housing (1) is provided with interconnected balance grooves (21) corresponding to the second hollow trunnion (20). 3. The high-power radial piston pump according to claim 1, characterized in that: the plunger (5) includes a plunger slide seat (6) matched with the pull ring (8); the plunger slide A central tube (11), a filled nylon (10) and an outer tube (9) are sequentially arranged on the seat (6) from inside to outside. 4. The high-power radial piston pump according to claim 3, characterized in that: the plunger slide (6) is provided with a central damping hole and a pressure balance groove. 5. The high-power radial piston pump according to claim 1, characterized in that: the piston cylinders (3) are evenly distributed on the circumference of the cam (12). 6. The high-power radial piston pump according to claim 3, characterized in that: the pull ring (8) can be two ring bodies with L-shaped cross-section, and the two L-shaped ring bodies are oppositely arranged on the cam (12), a slip ring is arranged between the two L-shaped ring bodies; the plunger slide seat (6) is arranged between the two pull rings (8) and passed through by the slip ring.